†Hillia Groot 1963 (horn coral)
Parent taxon: Stauriida according to S. Guo 1983
Sister taxa: Arachnophyllina, Aulophyllina, Calostylina, Caniniina, Columnariina, Cyathophyllina, Diffingiina, Ketophyllina, Kleopatrinidae, Lithostrotionina, Lomaphyllum, Lonsdaleiina, Lophophyllidiidae, Lophotichiidae, Lycophyllina, Metriophyllina, Mictocystoides, Petalaxidae, Petraphyllidae, Plerophyllina, Ptenophyllina, Stauriina, Stereolasmatina, Streptelasmatina, Yatsengiidae
Subtaxa: Hillia formosa, Hillia languida
Ecology: stationary epifaunal suspension feeder